Folding drawing-knife



C. B. SIMMONS.

FOLDING DRAWING KNIFE.

APPLICATION FILED JUNE27, 1921.

1,400,382, Patented Dec.13, 1921.

' I ventor M, aw 1 M Folding Drawing-Knives, of which the fol-' WiresSTATES PATENT oFricE.

CHARLES BERTRANDSIMMONS, 0F BRISTOL, GONNECTICUTgASSIGNOR TO ISRAEL -S.BAILEY, OF 'SOUTHINGT ON, CONNECTICUT.

roma ne DRAWING-KNIFE.

o all whom it may concern:

Be it known that I, CHARLES BERTRAND SIMMONS, a citizenof the UnitedStates, re-

siding at Bristol, in thecounty of Hart ford and State of Connecticut,have invented certain new and useful-Improvements in lowing is aspecification.

My invention relates to improvements in folding drawing knives, .andtheobjects of my improvement aresimplicity and economy in construction, andefliciency and convenience in use.

In the accompanying drawing Figure l is a sectional side elevation of myfolding drawing knife with one of the handles partly folded or turnedtoward the blade.

Fig. 2 is a sectional edge view of the same, the plane of section beingindicated by the line 2-2 of Fig. 1 and the point or direction of theview being indicated by the dart in the said Fig. 1.

Fig. 3 is a broken side elevation of the shank and head at one end ofthe drawing knife witlrattached spring latch, the handle and handle earsbeing removed.

A, designates the blade from the ends of which the shanks 4 project, thesaid shanks terminating in substantially circular heads 5 which aretruncated upon the outer edge to form the seat for the body of thespring latch 6. The heads are centrally perforated as at 7 Fig. 3, toreceive the hinge pintle 8 of the handle ears 9, 10. Each pair of handlecars is formed of two pieces of sheet metal with substantially circularheads centrally perforated to receive the pintle 8. and offset sidewiseto bring their shanks 11 together while their heads are spaced properlyto re ceive between them the terminal heads 5 of the shanks 4. Thehandle shanks 11 may be of any desired length and width and securedtogether by the rivets 12, Fig. l. The handles B are bored or recessedto receive the said shanks of the handle ears and may be secured to thesaid shanks by the pins or rivets 13. The said handles may be slotted asat 14, Fig. 1, to receive the cutting edge of the blade A when thehandles are folded upon it as is usual in this class of drawing knives.Thes pring latches may be secured to the shanks a in any ordinary manneras for example by means of the rivets 18. The

Specificatiouof LettersPatent. Patented Dec. 13, 1921.

1321. Serial No. 480,724.

said spring latches have a body of a width that may he within the spacebetween handle ears of each handle while at their opposite edges thecatch lugs 15 project substantially in the form of a cross asbest shownin Fig. 2.

The end of the spring that projects outside of the catch lugs is curvedupwardly as shown to form .a convenient handle 17. The circular heads ofthe handle ears, which are preferably of the same size as the heads 5,have notches 16 formed in their peripheral edges for the catch lugs tofall into for locking the handle in the desired positions. These notchesare preferably made a little the widest at their outer edge tofacilitate the The edge of the blade for the usual purposes, theoperator has but to lift the spring latch to bring the catch lugs out ofthenotches in the handle ears and then turn the handle inwardly. Thespring latch may be so lifted by pressing the ball of the thumb againstthe handle 17 of the said latch. Upon turning the handle, after thespring latch is withdrawn, the concentric faces at the edge of thehandle ears come under the catch lugs so that the spring latch may bereleased by the operator and let the catch lugs rest on the/edge of thehandle. ears, as shown at the right hand end of Fig. 1, the handle atthat end being shown at about half-way between its working and closedpositions. When the catch lugs thus rest on the edge of the handle earsit is only necessary to push the handle inwardly until it closes uponthe blade and the proper recess comes under the catch lugs which snapinto place and lock the handle in its closed or folded position. Uponwithdrawing the catch lugs from the recesses, the handle may be turnedto its working position and locked there by the spring catch as shown atthe left hand end of Fig. 1.

By my improvement, the construction is simple and inexpensive and thehandles are locked firmly in position by simple and convenient means. Iam also enabled to con 'struct the handle ears from sheet metal,

is on, the said spring latches having the two catch lugs projecting fromopposite edges and'handleears hinged to the said heads, and havingperipheral notches inthe edges for being engaged by theisa id lugs asthe spring latch falls between the ears. p

2. A drawing knife having the end shanks and heads \Vlinl spring latchessecured there on, the said latches having the two catch lugs projectingfrom opposite edges and a handle projecting outwardly from between thesaid catch lugs, and handle ears hinged to the said heads and havingperipheral notches for being engaged by the said catch lugs 3. Incombination 1n a drawing knlfe, a

blade having atoeach end a plate-like head and a blade shanl:intermediate said head" and the blade body, a handle structurecomprising a handle body andahandle shank structure, said handle shankstructure being composed of two similar pieces 0t sheet metal positionedin opposition one to the other, said pieces having the outer endsconnected-with the handlelbody, the inner-ends of said pieces being inthe form of ears that spring secured by one end to said blade shank,extended ever said head, and provided at each sidefedge with a laterallyextending catch lug for engaging with said notches, whereby the latchoperates to simultaneously make locking engagement individually with thetwo sheet metal pieces of the handle structure. I

CHARLES BERTRAND SIMMONS.

